Mk6 Projectile Replacement

You should be able to load an equivalent to the old 215 GR RN .303 in 7.62 mm fairly easily, after all .308 has a little (100 or so) FPS availabe than the old Mk 6 .303 British load.

Your components may differ slightly because of what is, or isn't, available in the U.K. as compared to what we get here, but substituions can be fairly simple with a decent cross reference.

Question. Are you allowed to use FMJ types for your work? I ask because I know they aren't legal for game stalking, but I don't know if you have different regulations for euthanasia purposes.

Heres a couple of loads I found in a manual.
For .308 Win:
Accurate Arms 2520 powder: 190 Gr SIE bullet (HPBT) 38.3 Gr for 2235FPS min to 42.5 Gr for 2500FPS MAX LOAD.

208 Grain Hornady A-Max bullet #30702, driven by Win 748 will go MAX LOAD, to 2450FPS.

Hornady makes a 220 Gr RN InterLock bullet number 3090, but again its not a FMJ, but a softpoint, or there is a #30903 225GR HPBT. Both could be reloaded with a slightly reduced starting charge from the list above for the 190GR.

Sierra makes a .311" 180 Gr that you could reload into .303 British cases as well. or theres a FMJBT 174 Grainer # 3131 for the .303 as well. Load data for that gives me top loads of 46.4 Gr of H414 powder for 2500FPS (MAX LOAD) which is more than the old Mk6's 2200FPS.

Hopefully this is a good starting point to work up a load that will do the job humanely for you. Based on these numbers it seems fairy easy to do, as long as there arent any legal restrictions on bullet types I found for your needs.

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Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?

Elderly Hunter: “That's dashed unsporting. Probably Belgium.”

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