Best H&N FTT size for .177 Optimus?

[RBQChicken]

I have a .177 Optimus, and so far have only been shooting Crosman hollow points through it. We don't have much selection where I live.  I like the H&N FTT pellets in .22, and would like to get some for the Optimus but I don't know which head size to get, 4.50, 4.51 or 4.52. 
Any suggestions? Thanks.

[SteveP-52]

I only have them in the 4.50 head size but they fit just snug in mine...it also shoots the H&N Sniper Medium and RWS Superdomes very well.

[Roadworthy]

If you MUST get the H&N FTT I suggest 4.52.  I have found them somewhat inconsistent of late and have gone to JSB Exact in 8.44 with much better results in a couple of my guns.  My Diana break barrels seem to prefer RWS Super Domes for whatever reason.

Happy Shopping.

[Ontarget58]

I'm a bit late to this conversation for sure but I thought I contribute my experience with H&N FTT .177.  I had ordered a tin in each size from Pyramyd and put about 150 from each tin through my Pelletgage (a most tedious exercise).  I did not find that the medium size of the 4.51 or 4.52 was any larger than the 4.50.  In fact, the 4.50 tended to be the largest head size at 4.50 or 4.51 but I did not take any notes or retain any records so this is just what I remember.  Size range was similar in all three tins, about 0.05.  Since then I have ordered the 4.50 only because they cost a couple bucks less but I like the H&N Sniper Medium even better (which come in one size only).

[RBQChicken]

Thanks for the reply. Good to know, and I had just read something good about the sniper pellets yesterday and made note to try some next time.