I have a new to me Sako A1 L461 in 223. I got my hands on some sierra 55gr bthp and H322 powder. The first thing I did was to find the lands by loading a blank casing and painting the bullet with a sharpie. Surprisingly in order to reach the lands the coal was way out of spec to fit in the magazine so I didnt bother with the typical 30 tho jump starting point or use my comparator! I made up some test loads and the bullet is seated to the neck base, which is how I like them for field loads. Tension is around 3 thou using before and after neck od measurement. Havent test shot any yet due to weather.
And then I took a 70gr speer sp ( for my 223 AR 1:8 deer load) and in-order to reach the lands it was 10 tho short of max 2.26in coal to fit in mag. Just used the 70gr to see the fit out of curiosity.
So, unless I am all wet, it appears my L461 has a much longer throat than one would expect to see in a chamber made for a 1:12 twist 40-55gr. Obviously a long bullet jump dosent seem to affect accuracy but just curious. Comments?
And then I took a 70gr speer sp ( for my 223 AR 1:8 deer load) and in-order to reach the lands it was 10 tho short of max 2.26in coal to fit in mag. Just used the 70gr to see the fit out of curiosity.
So, unless I am all wet, it appears my L461 has a much longer throat than one would expect to see in a chamber made for a 1:12 twist 40-55gr. Obviously a long bullet jump dosent seem to affect accuracy but just curious. Comments?