primers

[g n brezinski]

what primer small or large will give smaller groups in general.looking to build a groundhog gun in 6 mm cal for some long shots 400 to 500 yd.the 6 mm tub in norma make is large primer but the 6 mm on the 6.5 by 47 mm that the millitary shoot in com is small primer.being that the case are about the same size would i be better of with the small primer or am i spinning my wheels?
gary b

 

[Travelor]

My wife and I have been having great results with the Wolf Small Rifle Magnum primers in 6mmBR. The non-Magnum primers are way too soft, but the Magnum primers have been very good to us.