sierra 77 gr in 223 with 7 twist

[noname]

I'm trying to develop a load for 300 to 500 yard target shooting
using the 77 grain sierra's.So far the best I can get with any
powder is about 1.5 inch at 300 yds. How far are you guys letting
the bullet jump? I was trying .010 today..Powders used were
748,rx15,imr 4166,cfe 223 and H4895..Winchester brass and
cci 400 primers in a bolt actin from a rest on the bench.Thanjs for
any advice you have to offer..

[Robinhood]

Sierras accuracy load is RE-15 24.1 grs. @2750 fps/1293 ft.lbs.
They used Rem 7 1/2 primers. I drop a few tenths of a grain with CCI.

What powder scale?

Make and condition of brass?

[bc83]

Need to weigh brass and billets along with proper prep work to brass to get small groups at that range.

[m12lrs]

I'm trying to develop a load for 300 to 500 yard target shooting
using the 77 grain sierra's.So far the best I can get with any
powder is about 1.5 inch at 300 yds. How far are you guys letting
the bullet jump? I was trying .010 today..Powders used were
748,rx15,imr 4166,cfe 223 and H4895..Winchester brass and
cci 400 primers in a bolt actin from a rest on the bench.Thanjs for
any advice you have to offer..

1 1/2" group at 300 yrds? That is a half MOA group. Pretty good. For every tenth smaller it will take a lot of work with reloading techniques and components. That is if you have a rifle that is capable.

What rifle?

[noname]

Need to weigh brass and billets along with proper prep work to brass to get small groups at that range.

What the procedure for weighing brass? I would think after sizeing and trimming..And what weight difference does it have to be in..I do weight the bullets..All brass has the pockets reamed and flash holes debured..

[noname]

1 1/2" group at 300 yrds? That is a half MOA group. Pretty good. For every tenth smaller it will take a lot of work with reloading techniques and components. That is if you have a rifle that is capable.

What rifle?

Savage mod 10 with McGowing bull barrel..So far 456 rounds is all

[noname]

Sierras accuracy load is RE-15 24.1 grs. @2750 fps/1293 ft.lbs.
They used Rem 7 1/2 primers. I drop a few tenths of a grain with CCI.

What powder scale?

Make and condition of brass?

Either RCBS electric or Redding balance beam and they both weigh to same each time.Brass is Winchester,Once fired..

[Scott Evans]

Heck with the OCD weighing everything to a gnats pimple with no statistical proof. Try something simple that works-

Switch primers. Try 7 1/2's, 450's, 205M's. One of them will show an advantage.

[noname]

Heck with the OCD weighing everything to a gnats pimple with no statistical proof. Try something simple that works-

Switch primers. Try 7 1/2's, 450's, 205M's. One of them will show an advantage.

never thought about that..will see what I can find around here in whoville

[Scott Evans]

Primers are as much a variant as powder type, charge weight, and seating depth. Once you've found a pretty decent consistent load that doesn't shotgun, just switching primers can tighten it up considerably. Or turn it into a shotgun.

[homefrontsniper]

I would go with cci 450

[squirrel_slayer]

I believe the 77 smk was developed for mag use and i've found they like to jump. I load mine a 2.245". LC brass 09 and up, 23.2-24gr of 8208xbr is a common proven load lit with a cci 450 or rem 7 1/2. I personally use wolf srm's but they can't be found anymore to my knowledge. i'd love to find more. I do a light crimp with a lee fcd but I only use these in my gas guns currently.

I also sub the smk for the nosler CC and generally buy the "cosmetic blemished" from shooter pro as I feel they shoot just as well for a fraction of the cost.

being that you have a bolt gun i'd also reccomend you try the hornady eld-m offerings or if you can buy a stockpile of the 75 or 80 amax's they are also a great bullet. the BC is leaps and bounds above the dated 77 smk

[earl39]

Tula primers are the same as the wolf

[squirrel_slayer]

Tula primers are the same as the wolf

interesting but haven't those become unobtanium as well?

[earl39]

They are still out there