Johnw...ski
11-22-2009, 09:46 AM
I had Mountain Molds make me a 255 gr. 35 caliber mould and received it last August. I did cast some boolits with it to try it out but had no time to go further.
A few days ago I loaded some test loads and tried them out yesterday.
The mould was designed to produce 255gr. with an alloy of
91% Pb/3 % Sn/6% Sb. The meplat was as small as allowed and I tried to get generous lube grooves. The mold number is Mtn. Molds,255 gr,GC,#460nL
Using an alloy that is around 14 BHN I sized the boolits to .359 from .360 and attached a Hornady gas check lubing with White Label Carnuba Red.
I tried two loads 38.0 gr. and 39.0 gr. of IMR 4064 lit by CCI BR2 primers.
The 38.0 gr. load produced 2-1/2" groups at 200 yds., not too bad.
The 39.0 gr. load shot 1-3/4" groups at 200 yds. I can't complain about these results and I have only just started. There was not the least sign of leading when I cleaned the rifle so I expect to try some 40.0 gr. and maybe a 40.5 gr. load.
These results didn't just happen, I have been using Glenhills 245 gr. boolits with excellent results ( 40.5 gr. IMR 4064, 1-1/4" at 100 yds.) so I did have some idea of where to start. From a minute of angle standpoint I have already bettered my best groups. There may be still a bit more to be gained.
These were all shot therough an FDH#2 single shot (see avater) with a 26" barrel with 1 in 14" twist.
http://i280.photobucket.com/albums/kk166/JohnWski/MtnMolds255grGC460nL.jpg
A few days ago I loaded some test loads and tried them out yesterday.
The mould was designed to produce 255gr. with an alloy of
91% Pb/3 % Sn/6% Sb. The meplat was as small as allowed and I tried to get generous lube grooves. The mold number is Mtn. Molds,255 gr,GC,#460nL
Using an alloy that is around 14 BHN I sized the boolits to .359 from .360 and attached a Hornady gas check lubing with White Label Carnuba Red.
I tried two loads 38.0 gr. and 39.0 gr. of IMR 4064 lit by CCI BR2 primers.
The 38.0 gr. load produced 2-1/2" groups at 200 yds., not too bad.
The 39.0 gr. load shot 1-3/4" groups at 200 yds. I can't complain about these results and I have only just started. There was not the least sign of leading when I cleaned the rifle so I expect to try some 40.0 gr. and maybe a 40.5 gr. load.
These results didn't just happen, I have been using Glenhills 245 gr. boolits with excellent results ( 40.5 gr. IMR 4064, 1-1/4" at 100 yds.) so I did have some idea of where to start. From a minute of angle standpoint I have already bettered my best groups. There may be still a bit more to be gained.
These were all shot therough an FDH#2 single shot (see avater) with a 26" barrel with 1 in 14" twist.
http://i280.photobucket.com/albums/kk166/JohnWski/MtnMolds255grGC460nL.jpg