Quote Originally Posted by Utica1899 View Post
BarneyHunts and SlinkyPickle,
I have tried the 180gr round nose from Hornady
and while they shot well, these bullets are
constructed too heavy for the mild velocity that the 303
can produce. Another problem is if you try to seat them
in the canilure, the overall length is way out of specs.
Seeing as the 180gr are better suited to more powerful cartridges
like 300 Savage, 308 Win, 30-06 Spfld.

Before Barnes introduced their new 190gr, I was loading Hornady 170gr “30-30”
flat nose bullets and using 30-30 data that I worked up to in my rifle. And they
were very good for that rifle.

As far as data for the 190gr, I would recommend reducing
the starting charge of powder for the 190 by the same amount
as the 170gr is reduced from the 150gr.

this is 30-30 data from hodgdon ( I found this to be safe for my rifle)
USE CAUTION AND COMMON SENSE IF YOU USE IT IN YOUR RIFLE!!

For example: say you are using IMR 4064
A 150gr bullet has a starting charge of 31.0 gr
A 170gr bullet has a starting charge of 29.5 gr} 1.5 grains less
So if you keep the reduction of powder for bullet weight the same
then the starting charge for a 190gr should be 28.0 grains} 1.5 grains less than the 170gr
and then you would work up to the safe level for your rifle. And this would probably
translate over to other powders as well.
Thanks for this information!
Barney