Ultimatum U300 action
- Thread starter guntech
- Start date
Looks like they are reworking the website again, likely for the launch of the new action. Two days ago the acc page had secondary menus, now they're gone. Really interested in what the new action will bring to the table after the growing pains the u300 went through.
There seems to be several 'schools' of thought on this. Accuracy International appears to like longer tenon as do the discontinued SSG (steyr) as well as the 'PAS' action that held the 'F' class record for a while. I believe the Barnard actions as well as the older single shot Musgraves also liked a longer tenon. Of course their are many different approaches to ensuring a barrel 'hangs' properly...the steyr M300 (CISM) action is a good example of a long tenon but innovative machining to achieve stability. And then there are plenty of examples of short tenons (m700) and those that arent even threaded ... the aforementioned SSG...and all (most) of the Anschutz rifles (including their centrefire. 222rem)
I dont think it is entirely correct to think that tenon length or diameter (or even the absolute precision of mating of barrel to action threads) is not without some value.
Originally Posted by Leeper
To increase rigidity of the barrel/receiver connection, a longer tenon does little or nothing. An internal seat or a coned seat does a lot more but adds complexity. This is seldom popular with 'smiths and since any advantage is difficult to demonstrate, there is little reason to do it.
I don't think Bill was saying tenon length is not without some value... it's just a longer tenon does little or nothing... I agree.
To increase rigidity of the barrel/receiver connection, a longer tenon does little or nothing. An internal seat or a coned seat does a lot more but adds complexity. This is seldom popular with 'smiths and since any advantage is difficult to demonstrate, there is little reason to do it.
I don't think Bill was saying tenon length is not without some value... it's just a longer tenon does little or nothing... I agree.
Well I suppose the question is 'longer than what?' should a barrel tenon be a little less than an inch to accommodate gunsmiths who only own a 1" micrometer or should they be '3 calibres long'....or always the same length as a Remington model 700? Or the same length as a Sako TRG or an AI? Or is there a formula that specifies the optimal threaded tenon and shoulder area relative to barrel mass to length to calibre and bullet weight and powder charge and burn rate? What rules control the relationship between the barrel and action...and are they constant? The older DCRA shooters would explain their preference for no.4 actions for the longer ranges because they believed (based on results) that the less 'stiff' action of the no.4 was somehow 'compensating' for variations in muzzle velocity and giving tighter groups at 1000yds than achievable with forward locking actions.... I am always curious.
twosmokinspades
CGN Regular
I use to think getting the newest best action on the planet was going make or break the winners circle. Then one day a guy came out to a match with a 100 year old action, that he tweeked just a bit. He did very well. Mushman was there. Not saying the name on a acton is not important, i know it will help or what the heck are the benchrest guys doing. But how much will it help? For most applications including fclass a Remington acton works just fine. If you cant read the wind it will not matter what super duper action you have, you will still be gunning for last place. At the world fclass championship there we quite a few Remingtons and Savage actions. There were also lots of custom actions. So does the custom acton make you a better shooter? Well maybe. If it gives you confidence then yes. I have shot with guys that have different set ups take for instance Derek Rodgers (ftr world champion) he has a left bolt left port Panda action and shoots right handed. He believes this allows his trigger hand to stay on the gun and not realign his grip, this works for him. So now i would like to know how many guys are running out getting the same setup. When you ask Derek what he does to get to the top you'll be surprised what he does. He mostly does the the "4 B's" bullets barrel bedding and the bugger on the trigger. His panda action had some custom bedding involving a piece of stainless, he weighs all his components, buys good barrels and he does a lot of "PRACTICE". Now back to the Ultimatum acton, is it good, the one i played with seemed good, would i buy one yes, can i keep up to one with my Remington yes but the Remington needs work. Namely a detachable mag set up$$$ trueing $$$ in my younger life i was an avid hunter so i have more than a few Remingtons that have donner actions. So for now ill stick to remington. If i come across a good deal on an ultimatum i would defanetly make the switch. It does have a lot of nice feachers. I for one have always liked the idea of 3 lugs and the intigrated recoil lug. But thats just me.
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