cart SHOPPING CART You have 0 items
SELECT CURRENCY

Discussion Forums

1
Search forums

270win

20 May 2012
@ 02:17 am (GMT)

Trevor Wilkes

Hi Nathen,
I have some mild loads listed here that when I try work them up they go awol,well out to about inch.
130gr sst,57grs-2213sc
groups .570 at 100yds-.710 at 200yds consistant.
130gr nosler ballistic,52.5grs-2209
groups .460at 100yds. consistant.
Just curious if its the rifle may be recoil lug related or bedding or just me.
The 90g HPBT Sierras with 60grs of 2209 shoot-.223 at 100 yds the rifle is a tikka T3 stainless laminate stock.
Also is the 22 inch barrel to short for 2213sc as it seems to like 2209,I realise its a factory rifle am I just expecting to much from it.
Cheers.

Replies

1
22 May 2012
@ 04:27 pm (GMT)

Nathan Foster

Re: 270win
Hi Trevor, its a tough call for me. It is certainly easier when I can look over the rifle myself. Regardless,you have raised a point that is always good to discuss.

Quite often, a shooter will bring me a rifle, stating that as loads are increased the accuracy wanes, leaving the shooter with an established sweet spot at a low velocity. I then take on the rifle and do my thing. Quite often, I find that as loads are increased, the loss of accuracy was due to the client's inability to manage the increased recoil. This is not a bad thing at all because after discovering this, its a case of correcting shooter technique, practice and eventually, everything comes together.

The irony is, technology is advancing allowing the creation of ultra light rifles yet although we have achieved this level of engineering, due to the light weight platforms, shooting technique is now far more critical than it ever was. Felt recoil of modern rifles may well be light, but the actual recoil inertia and its effects on accuracy are utterly immense. This is so important to remember.

So I believe you are on the right track looking at your own technique, even utilizing the laminated Tikka which is heavier than the T3 Lite.

OK,so thats one factor. It may however be that the rifle is not capable of optimum accuracy at higher velocities. Occasionally a Tikka will have a sensitive bore and will suffer such limitations.

On the other hand, it could be a case of having not reached the upper sweet spot. Most rifles do have two, sometimes more sweet spots. You may have found the low sweet spot, but have not yet loaded high enough (sometimes past the manual listed maximum in the manuals if the rifle requires it) to find the high sweet spot. As an example, typical sweet spots for the .270 Win with 130 grain bullets can be up around 56.5gr ADI 2209 / 4350 and 54.5gr with 150 grain bullets. Thats about 5.5 grains past the listed maximums and I have gone higher. But you have to know how to read the brass, thats the key.

What we are talking about here (regarding powder charges) is not hot loading, its about getting the rifle up to its actual optimum pressure range, often due to loose tolerances that have inhibited optimum pressures with standard loads. There is a high possibility that your rifle is well under loaded. Keep this in mind.

Bedding of the T3 can be an issue occasionally but I would like you to view this as a last resort in this case. Work on the factors above to begin with.

Bullet jump for the SST .2mm. Bullet jump for the Nosler either .5mm or 1mm.

Yes, 2209/4350 is perfect for the .270. The rifles that really did well with 2213sc / 4831 were the old Finnbears and likes with super long throats and 24" barrels. We really don't see rifles like these anymore, bit of a shame.

When you get a chance, please experiment with the 150gr SST and if you find an accurate load, experiment with projectile annealing.

Keep us posted.

23 May 2012
@ 01:16 pm (GMT)

Trevor Wilkes

Re: 270win
Hi Nathen,
Thank you for the reply and very detailed at that makes it easy for people like me to understand that are new to reloading we are a lucky bunch to have your help.
You are right I havnt loaded past max but am getting more confident as time goes by and my knowledge grows so I will start at max with the 130s as I have already done these with no preassure sighns.
Im happy with the accuracy that Im getting just think there is better to be had out of this rifle so why not find it I say,I dont actualy have a purpose for this rifle where I reside so was thinking of using it to practice shooting longer distances well as far as its capable of shooting accurately to aid me when the 300 rum rocks up.
So I shall keep an eye on my technique and see how it goes and thanks again Nathen I slip you another donation next week.
Cheers.z
1
 

ABOUT US

We are a small, family run business, based out of Taranaki, New Zealand, who specialize in cartridge research and testing, and rifle accurizing.

store