Tikka T3...Mr Logic Home brews

[Deker 3,478]

Spent a chunk of yesterday at Bisley and Mr Logic had kindly made up a load of different .223 specials for me to try.

 

2 different 40g loads, 50g, 68g and 75g...yep...a bit of a session...anyway I am seriously impressed how well my T3 Lite handled ALL of this.....Every shot was centered, just higher or lower (200yard Short Siberia) and groupings of each were excellent. I have just had the barrel chopped by Neil Mckillop and it is now 18" and has a Predator 8 Compact on the end. No sight adjustment was made for any loads and the results only showed approximately a 6" spread (up and down only) for all the different ammo.

 

I'm struggling to understand quite how it is that my 1-8 twist seems equally at home with 40g right through to 75g. It really did handle and deliver them all in tight groups.

 

Credit also to Mr Logic for obviously doing a first class job in his loading room!!

 

PS. hopefully the final installment is about to begin in getting some balance into the T3 Lite...I have the lead (Church roof leaking somewhere) and I bought the expanding brown foam today...so a test run, and then the butt gets some weight in it!!!

[SportingShooter 0]

So he finally came up with the goods eh

 

Do I get the feeling that Deker may be investing in some loading equipment in the near future then on the basis of these results?

 

And getting such a wide variety of weights to group like that is puzzling me a bit as well, but stranger things have been known

 

Glad they shot well for you and best of luck with the balancing act, I hear Bertram Mills are recruiting if you have no success

 

SS

[lxx73 0]

Have you got any idea what the powder weight was in the 68gr?

[Mr_Logic 5]

23.5gr Hodgdon Benchmark, CCI Primer, COL 2.235", Federal brass.

 

68gr Hornady BTHP bullet.

 

And yep, they did shoot well

[lxx73 0]

23.5gr Hodgdon Benchmark, CCI Primer, COL 2.235", Federal brass.

 

68gr Hornady BTHP bullet.

 

And yep, they did shoot well

 

 

Tried reloading same bullet with Varget, Start load as per Hodgdon was 24gr on trying to seat bullet found too much powder and compressed load. How was it for the 23.5 ok?

[SNAP SHOT 194]

the faster twist will almost always stabilize a lighter bullet to the point of explosion due to centrifugal force, ripping the jacket off the bullet,

 

also a faster twist or overstabilization of a lighter bullet will also show a drop in velocity,

 

The quicker twist is needed to stabilize heavier bullets not due to the weight fact of the bullet but heavier bullets are always longer in length....

 

snap.

[Mr_Logic 5]

23.5gr Hodgdon Benchmark, CCI Primer, COL 2.235", Federal brass.

 

68gr Hornady BTHP bullet.

 

And yep, they did shoot well

 

 

Tried reloading same bullet with Varget, Start load as per Hodgdon was 24gr on trying to seat bullet found too much powder and compressed load. How was it for the 23.5 ok?

Benchmark is a fine powder so there is plenty of case left with 23.5gr.

 

My 308 load of 48gr of Varget is compressed though, absolutely fine to compress it...

[Deker 3,478]

the faster twist will almost always stabilize a lighter bullet to the point of explosion due to centrifugal force, ripping the jacket off the bullet,

 

also a faster twist or overstabilization of a lighter bullet will also show a drop in velocity,

 

The quicker twist is needed to stabilize heavier bullets not due to the weight fact of the bullet but heavier bullets are always longer in length....

 

snap.

 

 

Yep..I would tend to agree with that...BUT I was getting 1.5"-2" groups at 200 yards just chucking the 40g down the range, I'm sure I and the gun could have done better. So the bullet must have been flying well and not ripped apart...sort of what I don't quite understand!! ...and if I'm totally honest the worst group (although still good) was with the 75g heads!!

 

Not what I would have expected all round!!

[SNAP SHOT 194]

you have to reach a certain velocity to have jacket seperation, so you were more than likely under this velocity with the 40g as for the 75,

 

And you would also see seperation take place, in a cloud like puff,

 

they may have been going fast enough to stabilise, to you know when a bullet has not stabilsed as it will yaw to the target leaving an odd shaped hole not not a circular one like a bullet should......

 

snap.

[Mr_Logic 5]

They were stabilising OK as the group wasn't that bad, just not as tight as the others. May just be that the T3 doesn't like the longer COL which I made those with.

 

My Remington definitely DIDN'T stabilise the 75gr - not on the paper