right ho..you have asked so I shall do my best to answer....
your statement/question actually contradicts itself somewhat..... ok at lower speeds...dont expand very well at all
higher speed USUALLY means expands faster and a match type projectile has no criteria to do anything other than be accurate...the ones with J4 type jackets,thin soft jackets have reputation for expanding very well,if not too well at higher speeds BUT if the nose stays closed they may not open at all.
you COULD open tip up SLIGHTLY... take the copper back as straight as you can till cavity in nose it more open or even back till tiny bit of lead is exposed,to aid in its opening IF they are infact too hard and not opening properly...HOWEVER if they are already opening too well/exploding due to high speed/fast twist barrel and high velocity they will now be handgrenades at best. if you shoot to break shoulder bones,a stout projectile will work.heck even a FMJ will work if you are careful with shot placement,but a purpose designed cup n core will just do it better.
list what projectiles/loads you have got and we will see if indeed they are all no good or if there is something you have over looked.
Bookmarks