1891 Argentine sporter accuracy
I bought this rifle in a package deal looks pretty nice but I'm getting 3 inch groups at 50 yards. I have to believe these rifles shoot better than that. I'm using Prvi 150 and 180 gr ammo. Both shoot as bad. Is there a secret to making these things shoot or have I got a lemon? Thanx
Long cylindrical bullets needed here!
In my 1891 Argentine Engineers Carbine a 174 gn HPBT is nearly 1/2" clear of the case mouth before it touches the lands - your rifle will be similar. That means a lot of gas blow-by and a bullet being rammed into the transition cone with a skew and thus no kind of accuracy at all. You need a bullet with the longest cylindrical section you can find, and NO BOAT TAILS !!! A boat tail loses contact with the case neck very quickly, long before the base of the bullet has left the case.
Get yourself a pack of the Hornady Interlock #3130 174gn round-nose bullet and load them with the bullet seated so that the end of the case is on the crimp ring position (but do not crimp). Only neck-size the case (i.e. turn out the full-size die about 1/4 turn if you do not have a neck-sizer). Load with a starting load according to the reloading manual, and shoot again. The rifle should perform a lot better.
I know that the Hornadys are not cheap. An alternative would be to use cast lead bullets, as these usually have a good cylindrical section. But try the #3130 first, before worrying about bedding etc.
:wave:
Patrick
Old military rifles - long transition cones
The shooting world seems to be overly concerned with HPBTs as a means of obtaining the lowest possible BC, wind drift, whatever. But this focus on external ballistics is a false aim if the internal ballistics are bad as a result..
Many of the types of old service rifles that we use were designed in the 1890s, for long round-nose bullets, maybe later using "spitzer" bullets, but certainly not boattails. The transition cones tend to be long (very long in the case of the 1891 Mausers) and so boattails are poorly guided into the start of the rifling, with a lot of gas blow-by before they are finally engraved. Some shooters report better results with cast lead bullets, and I guess that this is because these bullets experience some degree of obturation (a.k.a. "bump-up") and thus actually fit the bore better than jacketed bullets.
:wave:
Patrick