I'm going to start reloading .303 for my 1905 ross rifle and I'm a little confused with the different bullet diameters used for this caliber. I did some research and most people say to get .310" to .312" diameter bullets, and that's what is says in my hornady reloading book too, but I took the calipers to some factory bullets (Prvi Partizan 150g SP, and Remington core lokt 180g SP) and they were .308" diameter for the Prvi and .303" for the Remingtons. So I'm wondering, is there going to be a change in accuracy with the bigger diameter bullets since they'll fit tighter in the barrel? Because right now, shooting mainly the Prvi's, the gun doesn't seem to be all that accurate, it's kinda all over a 12" target at 100 yards. Of course there's a good chance it's just me flinching cause the steel butt plate on this gun is a little rough, but theoretically speaking will it be more accurate with the bigger bullets?
beastybaconman
Joined
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309 Posts
Many reloading manuals as well as ammo mfg. will use undersized bullets especially for old Mil-Surplus caliber because of so many variation in groove dia.,throat depth etc. Nothing like shooting an oversized bullet in a smaller dia. bore and driving the pressure way up.
The best way to determine the correct dia. bullet for your rifle is to slug the bore and measure the groove to groove dia. As to whether the accuracy will change only testing some loads will tell but it's a pretty safe bet that you will shoot to a different POI with different dia. bullets. Also of note if you go with a larger dia. bullet that are listed in the reloading manuals you need to start with the starting load and work up from scratch.
Also on the 303 if it has a generous chamber like most 303 rifles,neck sizing will benefit you greatly when it comes to brass life and help minimize the possibility of case head separation.
The best way to determine the correct dia. bullet for your rifle is to slug the bore and measure the groove to groove dia. As to whether the accuracy will change only testing some loads will tell but it's a pretty safe bet that you will shoot to a different POI with different dia. bullets. Also of note if you go with a larger dia. bullet that are listed in the reloading manuals you need to start with the starting load and work up from scratch.
Also on the 303 if it has a generous chamber like most 303 rifles,neck sizing will benefit you greatly when it comes to brass life and help minimize the possibility of case head separation.
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