Hi all, I was wondering if anyone has ever done any testing to quantify, on average, how much precision is gained by having a Remington 700 action trued on a lathe. For arguments sake, lets say I have a Rem 700 action. I buy a custom barrel and have it installed on the action (as it was from the factory). Now I assume we could all agree that because of the new custom barrel, we should notice improvements in the precision of this rifle. So then lets remove that barrel, have the action trued, lugs, bolt face etc and then lets fit that same custom barrel back to the action which has now been trued. How much more precision have we gained? Has anyone done an experiment, or read an article about an experiment, where something like this was done? In other words, all other tings being equal, would truing the action afford you 0.25 MOA better groups for example? I understand the reason for truing an action, to get everything parallel and/or perpendicular and flat etc, but what I don't really know is HOW MUCH better it makes it.
Trued Remington 700 accuracy improvements?
- Thread starter SouthPaw700
- Start date
It's probably like asking how much improvement does getting your teeth straightened make. It would depend on how crooked they were to begin with. By the time you correctly align the receiver or bolt on a lathe to measure the runout, you're done the hard work.
That's some of the experimentation I plan to do and document, once I can get started on it that is. A lot of it I plan to do with a shooting rig to keep as much of the shooter and placebo factor out of the equation as possible, would be nice to do it in a tunnel to keep wind out of it too, but no such luck.
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
My SWAG would be less then 1/4 min.
Where you will see the biggest change is in the ability of the case to remain concentric and not look like a banana or expand beyond its ability to be reused.
I have had the pleasure of playing with a wide range of solid front locking actions of various makes and vintages. Pretty much all of them had "most" of the lugs contact the receiver to varying degrees. NONE had been trued and shimmed. Accuracy ranging from 2 to 3's were common place with quality ammo in quality barrels.
We also know that full on BR type actions with the best of everything still hover in the 1s with some in the 2's and the rare rifle holding the 0's all day long.
Pressure containment is the largest benefit of full on action tuning. This leads to better cases which leads to better ammo which leads to better accuracy.
Jerry
Where you will see the biggest change is in the ability of the case to remain concentric and not look like a banana or expand beyond its ability to be reused.
I have had the pleasure of playing with a wide range of solid front locking actions of various makes and vintages. Pretty much all of them had "most" of the lugs contact the receiver to varying degrees. NONE had been trued and shimmed. Accuracy ranging from 2 to 3's were common place with quality ammo in quality barrels.
We also know that full on BR type actions with the best of everything still hover in the 1s with some in the 2's and the rare rifle holding the 0's all day long.
Pressure containment is the largest benefit of full on action tuning. This leads to better cases which leads to better ammo which leads to better accuracy.
Jerry
paperslayer
Regular
- Location
- Chilliwack
it is all about removing variables and inconsistencies. I doubt there is any way of properly measuring, but in this game you are allowed to have intuititive and intellectual opinions.
I have only had one rifle "accurized" with no components at all replaced.The receiver and bolt face were trued, the lugs were lapped, and the crown was redone. The rifle was a 700VSSF that averaged 7/8" before the work was done, and it averaged 5/8" after the work was done by Rod at Corlanes.
That's not too shabby considering it only address one of many issues in accuracy. It may not be the best "bang for the buck" but when you've exhausted all other avenues, how else are you going to beat the competition?
This pretty well covers it...
If the action and bolt are pretty true to start with you won't see a lot of improvement... and to set up and see how true the action is, the time involved - you might as well just true it and get it over with... it's a one time job if done right.
RockChucker
CGN frequent flyer
- Location
- Whitehorse, Yukon
A point to ponder..............
If the action was trued, why did the original barrel fit? Action threads are usually recut 10 thou larger when truing.
RC
Probably fine regardless. You have to figure the threads are around .054 deep and if you cut them 10 thou shallower you still have .049 per side to engage. Not saying its optimal, but that it's not reckless either. Guntech says some respected gunsmiths re-use the stock barrel after truing the threads of the receiver.
RockChucker
CGN frequent flyer
- Location
- Whitehorse, Yukon
The safety of it was not the concern but the reason for truing up the thread in the action is the only thing in question. Why do all the other work to the action and settle for factory threading?
If it is of no concern [regarding accuracy], why bother to true up the threads at all?
If you plan on doing the steps of truing up the action go all the way or not at all.
RC
If it is of no concern [regarding accuracy], why bother to true up the threads at all?
If you plan on doing the steps of truing up the action go all the way or not at all.
RC
60 degree V threads self center when torqued tight... the fit of the barrel threads/action threads can be quite loose with no loss of accuracy providing they are true to each component. Thread strength is not a problem with loose threads either. It only requires 3 threads to hold a barrel on. Fitting a standard 1.060" Remington barrel thread into an action that was trued by cutting threads 10 thou larger is not a problem. You may not like it for cosmetic reasons.
