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- Thread starter R.C.Saul
- Start date

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338 Edge - 1600 + yards

338 Allen Mag - Maybe about 23/2400 yards.

I think it comes down to the lowest velocity that the 300 SMK will perform terminally.

The Allan Mag is an orbit or two beyond the Edge.

Neither is a sloutch.

I didnt know there was that much difference. Does anyone know the max effective range on a whitetail with either caliber?

RC, that's a tough question to answer and basically depends on where you draw the line on a bullet's terminal performance vs the game you are shooting. I use the minimal expansion velocity of the bullet as a limiting factor. With the SMK, there is no such published velocity. From some reports I've read on this site, it seems the 300 SMK will expand below 1800 fps. So the bottom line would be to run the numbers in a balistic calc to get *your* effective range.

JBM - Calculations

Hope that helps,

Mark

I didnt know there was that much difference. Does anyone know the max effective range on a whitetail with either caliber?

Way farther than most can shoot effectively. It's hard far me to find a spot on the ranch in south Texas to max the edge out and it's 6000ac out in west texas no problem. i just dropped a 70-80# hog in its tracks at a 1000yrd with my edge. I would say edge 1500-1750 338am 1750-2200 just a guess on my part. probably has more to do with what speed you need to get your bullet to expand right

Maybe you were thinking about Kirby's 338 AX (Allen Xpress), which is the 338 Lapua case, Improved.

If I am not mistaken (and this happens more, the further north of fifty I get), the 338 AM is based on the 408 Cheytac case - a much larger case than the 300 RUM, on which the edge is based. Perhaps a better comparison would be between the the edge and the 338 Allen Express, which is based on the 338 Lapua Magnum case. The 338 AE case has the sides blown out and the shoulder moved forward with a slightly different angle (if I am wrong here, I am sure Kirby will jump in and correct me). I tend to think of the 338 Allen Express as a 338 Lupua Magnum that has been ackley improved.

For most of us, the ballistic difference between the edge, the 338 LM and the 338 RUM are just not big enough to bother with. It may exist on paper for those who like to debate ballistics, but in the field they all work well.

270 WSM case.........107 gr ULD RBBT.......3400 fps

257 Allen Xpress

300 Dakota case......142-156 gr ULD RBBT...3300-3100 fps

6.5mm Allen Xpress

300 Dakota case......142-165 gr ULD RBBT...3350-3100 fps

270 Allen Xpress

300 Dakota case......169.5 gr ULD RBBT.....3200 fps

257 Allen Magnum

338 RUM case.........156 gr ULD RBBT.......3300 fps

6.5mm Allen Magnum

338 RUM case.........165 gr ULD RBBT.......3300 fps

270 Allen Magnum

7mm RUM case.........169.5 gr ULD RBBT.....3400 fps

277 Allen Magnum

338 Lapua case.......195 gr ULD RBBT.......3200 fps

7mm Allen Magnum

338 Lapua case.......200 gr ULD RBBT.......3250 fps

338 Allen Magnum

408 Chey Tac.........300 gr ULD or SMK.....3400-3500 fps

Both cartridges are outstanding.

+1! Not to mention both are excellent gunsmiths and in LR hunting/shooting. Win-win either way!

Does Mr. Allen have a web site? Looks like a person could send lead a pretty good distance with lots of knock down using his calibers. Thanks for all the replies.

He does not have a website, but the cartridge descriptions in the link below should contain "most" of Kirby's line of long range designs.

Dave

http://www.longrangehunting.com/forums/f23/allen-mag-shooters-group-18433/index39.html