22 Grendel and 22 ARC reamer prints

[SWF Shooter]

Ok, for starters, that's .0004, not .004 in the previous post that you quoted. So frankly, unless there are much more significant changes, what difference does it make. I got my info that I posted previously from a reamer maker,(the one making the reamers per engineers blueprints) before it was public nor saami announced. In the end, I didn't and I don't question a thou or so anywhere, much less .0004. Granted, there will be a saami version in PRINT and there will be other variations that are different, for a number of reasons. So I'm wondering, what difference does it make if we're talking a thou or less, anywhere, in terms of saami or not? Keep in mind that saami's prints and tolerances are generally pretty liberal. Oops...that phrase made my stomach turn a little. Lol!

Ultimately, everything has tolerances...reamers, dies, brass and even the reamer and reamer prints themselves.

So, what exactly is the point. Seriously? Are you a reamer maker, smith or what? I ask these things in all sincerity and not to sound like an arse. I just honestly don't know when we stop splitting hairs and just shoot. Engineers draw prints with stated tolerances and then reamers and dies are made to those. SMH, but maybe I'm missing something. Again, not ill will intended at all. If there is a change in the saami reamer dimensions, it will very likely be reflected in the die reamers supplied to Hornady and other makers, all made on a production line that has significantly bigger tolerances than we're talking about here... .0004 or less.

This is all an inexact science compared to the numbers that get spouted on the internet, more often than not...believe it or not.
An example of my point is that Redding's engineers changed their die dimensions for a 6.5 Grendel die several years afterward without anyone knowing. Same kinda deal I think. It was less than a thou, best I can measure and account for springback, etc. You may know all of this very well. I don't know and am not assuming that, but look at a reamer print and lets go from there.

In the end, it appears that Hornady intentionally made the 22 ARC a copy of a 22 Grendel, minus any small and irrelevant changes within a tiny amount, one way or the other...which actually makes good sense in every way.

According to the reamer maker for hornady's chamber and dies, for what I assume will be submitted to saami...the "new" 22 arc is in fact a 22 Grendel. I don't think this is a big secret or I would not post it anywhere. It will come out anyway.

Based on the reamer prints there are a few dimensions that differ are actually at different heights from the base, what do you think of the longer freebore, 0.0600 for the 22 Grendel, increased to 0.1314 for the 22 ARC? It seems that will make it a challenge to get closer to the lands with longer ogive bullets at standard AR15 mag lengths, with jump sensitive bullets, or do you feel that is a non-issue?

 

[gunsandgunsmithing]

Based on the reamer prints there are a few dimensions that differ are actually at different heights from the base, what do you think of the longer freebore, 0.0600 for the 22 Grendel, increased to 0.1314 for the 22 ARC? It seems that will make it a challenge to get closer to the lands with longer ogive bullets at standard AR15 mag lengths, with jump sensitive bullets, or do you feel that is a non-issue?

I'll have to look at prints and see the differences in neck lengths and oal case lengths. Bear in mind too, I seldom deal with saami throat lengths. Those things are within my and or my reamer makers control. I'll try to look closer at things tomorrow but there is no saami 22 Grendel so it's apples to oranges.

 

[LiveFire]

I feel like Hornady has been getting some pushback on these "hornady developed new cartridges." Enough pushback they released a new podcast episode, Episode 101 "how commercial cartridges are born." Was released Nov 16th of this year. They basically spend the entire podcast saying they don't just change a dimension on a wildcat and bring it to market but that seems to be what theyre doing with the 22 ARC and 6 ARC. Maybe I'm wrong on that. I do not know much about cartridge development and design. The only wildcat I have is a 6x45.

 

[gunsandgunsmithing]

Based on the reamer prints there are a few dimensions that differ are actually at different heights from the base, what do you think of the longer freebore, 0.0600 for the 22 Grendel, increased to 0.1314 for the 22 ARC? It seems that will make it a challenge to get closer to the lands with longer ogive bullets at standard AR15 mag lengths, with jump sensitive bullets, or do you feel that is a non-issue?

I don't see much other than the freebore, unless I missed it..certainly possible.As to the freebore though, they are marketing it as a long range ar15 cartridge and throating it accordingly, it appears. You're right that it may cause issues at mag length with some bullets but something tells me that it'll work with Hornadys. Lol! They may or may not reach the lands at mag length, by design, to hold pressures down. Weatherby made a living with long freebores and his magnums being faster than his competitors version. A little free speed potential, within pretty tight pressure constraints.

The headspace is the same and it lists the same parent case and shoulder angle. Just no significant change from the wildcat that I see. A miniscule change in body dimensions means very little at all. Their engineers had to make it appear that they were working on something. Lol!