Old vs newer 162 Amax's

[sobrbiker883]

I just came into around 400 of the old style .284 162gr Amax's.

These puppies are 1/8" longet than the current Amax's and have a narrower base at the boatail. Laying on the bench side by side you'd swear they are different calibers!

I'm sure they are good bullets, but am curious if anyone knows are there any differences I need to be aware of, or any correlaries I need to be aware of between the two? Does the older one have a differnt BC (probably), and if so do you know what it is?
Obviously what's in the case will be different (.115" deeper if I use up most of the .015" available mag length I have with the current load), but will the slimmer boattail help with the pressure at similar charges?

If there is a different charge required to acheive same speed, can anyone give me a ballpark difference (percentage wise) they found they had to use given everything else in the load unchanged?

Just trying to start ahead of the curve-don't want to go nuts working up what is going to be relatively temporary in inventory......

Current (left), old dtyle (right)

 

[sobrbiker883]

Re: Old vs newer 162 Amax's

The 6mmbr.com's 7mm page shows the old an dnew in a pic, but doesn't have any real meat on the change....
http://www.6mmbr.com/7mm284.html

 

[ChrisGarrett]

Re: Old vs newer 162 Amax's

Kind of funny, I have three different variations going back to the 70s, of their 162gr HPBT National Match .284/7mm bullets I've acquired over the years.

I thought I was going nuts when I pulled some from one box and was getting totally different--like 60 thous, ogive numbers with the Hornady OAL gage.

Got 'em all out and triple checked things and wrote down on the boxes, what was what.

Yours will shoot fine, but you might ultimately have differing BCs if you're running a ballistics program, although if it's slight, it shouldn't matter too much.

Chris

 

[sobrbiker883]

Re: Old vs newer 162 Amax's

Well, so far- at same OAL as current load:
-the ogive's .016" further towards the lands (but still jumping-this douglas was cut with a Linda Lovelace reamer)
-the boolit is .133" deeper in the case (looking at the shape's I'm hoping the actual case volume taken up by boolit is close enough that things will be hunky dory).

I do know I've been through a few versions of .224 75gr BTHP's with Hornady too........

 

[bohem]

Re: Old vs newer 162 Amax's

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sobrbiker883</div><div class="ubbcode-body">Well, so far- at same OAL as current load:
-the ogive's .016" further towards the lands (but still jumping-this douglas was cut with a <span style="font-weight: bold">Linda Lovelace reamer</span>)
-the boolit is .133" deeper in the case (looking at the shape's I'm hoping the actual case volume taken up by boolit is close enough that things will be hunky dory).

I do know I've been through a few versions of .224 75gr BTHP's with Hornady too........ </div></div>

Hahahaha, that made me chuckle... I might have to use that one in the future.

With the longer bearing surface on the old ones be prepared to find that your loads need some tweaking. Something that's "on the edge" of pressure with the new bullets very well may put you over the edge with the old style.

I haven't worked with them enough to help any more than that.

 

[wolfman]

Re: Old vs newer 162 Amax's

I've been wondering the same thing. I got 400 of the old ones without realizing it, and noticed the boxes say 1-8" twist. Will just have to try and see.

 

[sobrbiker883]

Re: Old vs newer 162 Amax's

Hornady days 1:8 for new ones too.

My barrel's 1:9.5/1:10 best I can measure and the new ones are stable at 1000 with a 2700MV and 3000DA so I wouldn't seat that too much.