300WM with 190s What sort of FPS?

[BTSniper]

What sort of FPS are you guys getting with 190 grain match bullets in the 300WM? These where old Winchester 190 grain match bullets. Look just like the Sierra 190s.

I got some impressive numbers out of a 28" BBI match barrel and I'm curious how it compares.

I was pushing them to 3250 FPS loaded long at 3.50" COL with RL-22. The CBI Match camber has a good amount of free bore for loading the big bullets. According to my quickload program and the primer indications I still had 3.5 more grains worth of pressure to go, I believe it as the pressures indications where pretty minimal. At a estimated max load I would guess potential velocity in the neighborhood of 3400FPS! Depending on the accuracy of the quickload predictions I was getting 225fps more then it calculated for my loads.

Before anyone calls BS I got the barrel Black Nitride processed and I'm wondering if I have gained substantial FPS???? I was not smart enough to get FPS results before I sent the barrel in. I actually tried but it was too dark outside.

Thanks


BT

[LongRange]

ive shot 190SMKs out of my 300wm but never checked the speed as i never really found a load but i can tell you that ive shot 210SMKs over a chrony at 3075FPS...they were not accurate...im shooting 208g hornadys now at a little over 2900FPS so i could see a 190g bullet going 3250 and even 3400 the question is are they accurate at those speeds and with all that powder to move them that fast its going to shorten you barrel life a lot.

[Londerko]

3400 would be awesome if it's accurate!!!
My best accuracy with a 190 in 300wm is at 2950 fps using 73gr of H4831. I am using a 24" sporter barrel, it would probably be 3000-3050 with your 28". I've never messed with R22, but I hear it has better velocity.

[LongRange]

thats fast out of a 24" barrel...22 will net more speed for sure.

[yobuck]

I use 190 smks for long range hunting in a shortened case version of the 30x378 wby. Ive owned the gun for a long time and before the ultramags existed.
The relativly new 300 norma case is within 1 gr of water capacity to my case. That said if i were to rebarrel today, my choice would be the 300 norma due to
the ease of aquiring brass as compared to making it. My gun is built on a mark 5 weatherby action which i prefer due to bolt face size for that size case.
I can get 3400 + from the 190 in the 30" barrel with 98 gr retumbo. Ive recently backed off the load to 97 gr due to the age of some of my brass.
All the data would indicate a 200 to a 215 gr bullet would be a better choice balisticaly speaking. But weve found the 190 at this velocity is an awsome performer.
Ive no doubt the Berger 190 would be also. The gun is set up as a single shot and weighs just about 20# with the 8.5x25 leupold scope and is actually my favorite gun.
If i were to be using the gun beyond the 1200 yd max limit i put on it, id no doubt be using a heavier bullet. But now were in big 338 territory.

[BTSniper]

Yep I hear you guys.... depends if it will be accurate at faster speeds... TRUE. So far the accuracy is looking good between 3075fps with a 73 grain load and 3150fps with a 74 grain load. The 75 grain load was starting to open back up at 3210fps and I only had a couple rounds loaded with 76 grains that went 3250fps but not shot for accuracy. The 73 grain load would be a pretty good load I suppose, easy on barrel and brass but with the up end untested I'm wondering if there might be another accuracy node there?

These loads are at or over published max by book specs for standard length OAL, I get away with it because of the long OAL of 3.55" and free bore of the chamber vs. 3.34" of the standard 300WM, Standard reloading precautions apply.

BT

[Londerko]

Is their a rule of thumb for how much a longer coal lowers your pressure? For example: for every .010" over saami lemgth you can add 0.25 grains? Or something like that?
I ask because my load for 190smk and 185 Berger is 73 of H4831, and it is at published max. But I also load my cartridges longerto 3.42" instead of 3.34" because that's what will fit in my magazine. I have a feeling that I am no where near "true max" what do you guys think about trying to work up slowly to 74 or 75 grains with that longer coal?
Thanks -Leo

[BTSniper]

Only info I have is based on the computer "quickload" program. This program even lists the different brands of 300WM brass with their different case capacities. What brand of brass are you using? what length barrel? do you know the fps?

I entered your numbers with H4831 into the program, with RP brass at your 3.42" it figured 61,614psi with 62,366 being max. Now change the brass to the larger capacity Win and you get 52,941psi

Take it for what it is worth.... a computer program spitting out "best guess" numbers posted by somebody on the web.

BT

[Londerko]

BT, Thanks for putting my info in.
Wow! I knew that brass brands had different capacities, but I had no idea it was that drastic.
I'm currently using Nosler, (I think it's actually Norma) and I'm getting 2941fps, SD of 5 with a 24" factory sporter barrel.
My brass is fire formed and neck sized only, I guess that mite increase capacity a little too???
Thanks - Leo

[yobuck]

Ive mentioned my experience using 30 cal 190s and the gun i use them in to get the speed i get with them.
There are no majic formulas, powder is the necessary ingrediant which correlates with case size then barrel legnth in order to burn it.
Thats what amazes me with some of the claims about velocity some get with guns not known to produce it.

[Berger.Fan222]

I've never gotten velocities anywhere near that. Keep an eye on those pressures. If you get loose primer pockets in 2-3 firings, your pressures are too high.

[Luke45]

I use 190 smks for long range hunting in a shortened case version of the 30x378 wby. Ive owned the gun for a long time and before the ultramags existed.
The relativly new 300 norma case is within 1 gr of water capacity to my case. That said if i were to rebarrel today, my choice would be the 300 norma due to
the ease of aquiring brass as compared to making it. My gun is built on a mark 5 weatherby action which i prefer due to bolt face size for that size case.
I can get 3400 + from the 190 in the 30" barrel with 98 gr retumbo. Ive recently backed off the load to 97 gr due to the age of some of my brass.
All the data would indicate a 200 to a 215 gr bullet would be a better choice balisticaly speaking. But weve found the 190 at this velocity is an awsome performer.
Ive no doubt the Berger 190 would be also. The gun is set up as a single shot and weighs just about 20# with the 8.5x25 leupold scope and is actually my favorite gun.
If i were to be using the gun beyond the 1200 yd max limit i put on it, id no doubt be using a heavier bullet. But now were in big 338 territory.

isn't this about 300 WM ? LOL

[yobuck]

Well Luke as always you are correct. It is about a 300 wm.
And im sure im wrong at least in your opinion for offering up
information as to what type of gun/load it takes to achieve the results being asked about.
Which were in case you missed that part, about getting 3400 fps with a 190 gr 30 cal bullet.
So unless youve got something better to offer than sarcasim why not just go take your skateboard for a ride.

[Luke45]

So unless youve got something better to offer than sarcasim why not just go take your skateboard for a ride.

go hop on your covered wagon and go for a ride ;)

[B Coz 312]

OK I am new this forum, I have been loading long time playing with different loads and powers to get the best from my gun. Here is what I loaded for my last trip hunt. Nosler 180 Ballistic tip with 70 grains IMR4350 I was getting 3100 fps and proved to be very accurate. I could clover leaf a group in the red on a 25 yard target at 100 yards. The mule deer I got in Wyoming was at just over 900 yards from top of the ridge down to the creek bed. I was shooting from a Savage 110FP Tactical with bipod.